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<div class="APPENDIX"><h1><a name="SQL-KEYWORDS-APPENDIX"></a>附录C. SQL 关键字</h1><a name="AEN71382"></a>
<p><a href="sql-keywords-appendix.html#KEYWORDS-TABLE">表C-1</a>列出了所由在 SQL 标准和 PostgreSQL 8.2.3 里是关键字的记号。你可以在<a href="sql-syntax-lexical.html#SQL-SYNTAX-IDENTIFIERS">节4.1.1</a>里找到相关的背景信息。</p>
<p>SQL 里有<i class="FIRSTTERM">保留字</i>和<i class="FIRSTTERM">非保留字</i>之分。根据标准，保留字是那些真正的关键字；决不能用它们做标识符。非保留字只是在特定的环境里有特殊的含义，而在其它环境里是可以用做标识符的。大多数非保留字实际上都是 SQL 声明的内建表和函数的名字。而非保留字的概念实质上只是用来表示在某些场合里，在一个字上附加了一些预先定义的含义。</p>
<p>在 PostgreSQL 里，分析器的工作有些复杂。因为存在好几种不同范畴的记号，从那些永远不可能用做标识符的到那些和普通标识符比较起来在分析器里完全没有任何特殊状态的(后者通常都是 SQL 声明的函数)。即使保留关键字在 PostgreSQL 里都没有完全保留，而是可以用做字段标签。比如，虽然 <tt class="TOKEN">CHECK</tt> 是保留关键字，但是 <tt class="LITERAL">SELECT 55 AS CHECK</tt> 语句完全行得通。</p>
<p>在<a href="sql-keywords-appendix.html#KEYWORDS-TABLE">表C-1</a>的"PostgreSQL"字段里，我们把那些分析器明确知道，但是可以在大多数需要标识符的环境里用做标识符的关键字分类为"非保留"。虽然一些关键字是非保留的，但是却不能用做函数或者数据类型名字，我们对这些关键字相应做了的标记。大多数这类记号代表有特殊语法的内置函数或者数据类型。仍然可以使用这些函数或者类型，但是用户不能重新定义它们。标记为"保留"的都是那些只允许出现在"AS"字段标签名里面(以及少数几个其它环境)的记号。有些保留关键字还可以用做函数的名字；这点在表中也显示出来了。</p>
<p>一条通用的规则是：如果你看到任何古怪的分析错，说命令包含任何这里列出的关键字做标识符，那么你可以先试试用双引号把那个标识符括起来，看看问题是否消失。</p>
<p>在开始学习<a href="sql-keywords-appendix.html#KEYWORDS-TABLE">表C-1</a>之前还要理解的一件重要的事情是：一个关键字在 PostgreSQL 中没有保留并不意味着与该关键字相关的特性没有实现。同样，关键字的存在也并不表明某个特性就一定存在。</p>
<div class="TABLE"><a name="KEYWORDS-TABLE"></a>
<p><b>表C-1. SQL 关键字</b></p>
<table border="1" class="CALSTABLE"><col><col><col><col><col>
<thead>
<tr><th>关键字</th><th>PostgreSQL</th><th>SQL:2003</th><th>SQL:1999</th><th>SQL-92</th></tr>
</thead>
<tbody>
<tr><td><tt class="TOKEN">A</tt></td><td>&nbsp;</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">ABORT</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">ABS</tt></td><td>&nbsp;</td><td>保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">ABSOLUTE</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">ACCESS</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">ACTION</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">ADA</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">ADD</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">ADMIN</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">AFTER</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">AGGREGATE</tt></td><td>非保留</td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">ALIAS</tt></td><td>&nbsp;</td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">ALL</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">ALLOCATE</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">ALSO</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">ALTER</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">ALWAYS</tt></td><td>&nbsp;</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">ANALYSE</tt></td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">ANALYZE</tt></td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">AND</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">ANY</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">ARE</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">ARRAY</tt></td><td>保留</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">AS</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">ASC</tt></td><td>保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">ASENSITIVE</tt></td><td>&nbsp;</td><td>保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">ASSERTION</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">ASSIGNMENT</tt></td><td>非保留</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">ASYMMETRIC</tt></td><td>保留</td><td>保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">AT</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">ATOMIC</tt></td><td>&nbsp;</td><td>保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">ATTRIBUTE</tt></td><td>&nbsp;</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">ATTRIBUTES</tt></td><td>&nbsp;</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">AUTHORIZATION</tt></td><td>保留(可以是函数)</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">AVG</tt></td><td>&nbsp;</td><td>保留</td><td>非保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">BACKWARD</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">BEFORE</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">BEGIN</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">BERNOULLI</tt></td><td>&nbsp;</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">BETWEEN</tt></td><td>保留(可以是函数)</td><td>保留</td><td>非保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">BIGINT</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">BINARY</tt></td><td>保留(可以是函数)</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">BIT</tt></td><td>非保留(不能是函数或类型)</td><td>&nbsp;</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">BITVAR</tt></td><td>&nbsp;</td><td>&nbsp;</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">BIT_LENGTH</tt></td><td>&nbsp;</td><td>&nbsp;</td><td>非保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">BLOB</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">BOOLEAN</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">BOTH</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">BREADTH</tt></td><td>&nbsp;</td><td>非保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">BY</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">C</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">CACHE</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">CALL</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">CALLED</tt></td><td>非保留</td><td>保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">CARDINALITY</tt></td><td>&nbsp;</td><td>保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">CASCADE</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">CASCADED</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">CASE</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">CAST</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">CATALOG</tt></td><td>&nbsp;</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">CATALOG_NAME</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">CEIL</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">CEILING</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">CHAIN</tt></td><td>非保留</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">CHAR</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">CHARACTER</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">CHARACTERISTICS</tt></td><td>非保留</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">CHARACTERS</tt></td><td>&nbsp;</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">CHARACTER_LENGTH</tt></td><td>&nbsp;</td><td>保留</td><td>非保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">CHARACTER_SET_CATALOG</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">CHARACTER_SET_NAME</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">CHARACTER_SET_SCHEMA</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">CHAR_LENGTH</tt></td><td>&nbsp;</td><td>保留</td><td>非保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">CHECK</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">CHECKED</tt></td><td>&nbsp;</td><td>&nbsp;</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">CHECKPOINT</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">CLASS</tt></td><td>非保留</td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">CLASS_ORIGIN</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">CLOB</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">CLOSE</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">CLUSTER</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">COALESCE</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>非保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">COBOL</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">COLLATE</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">COLLATION</tt></td><td>&nbsp;</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">COLLATION_CATALOG</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">COLLATION_NAME</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">COLLATION_SCHEMA</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">COLLECT</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">COLUMN</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">COLUMN_NAME</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">COMMAND_FUNCTION</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">COMMAND_FUNCTION_CODE</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">COMMENT</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">COMMIT</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">COMMITTED</tt></td><td>非保留</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">COMPLETION</tt></td><td>&nbsp;</td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">CONCURRENTLY</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">CONDITION</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">CONDITION_NUMBER</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">CONNECT</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">CONNECTION</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">CONNECTION_NAME</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">CONSTRAINT</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">CONSTRAINTS</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">CONSTRAINT_CATALOG</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">CONSTRAINT_NAME</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">CONSTRAINT_SCHEMA</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">CONSTRUCTOR</tt></td><td>&nbsp;</td><td>非保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">CONTAINS</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">CONTINUE</tt></td><td>&nbsp;</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">CONVERSION</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">CONVERT</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>非保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">COPY</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">CORR</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">CORRESPONDING</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">COUNT</tt></td><td>&nbsp;</td><td>保留</td><td>非保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">COVAR_POP</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">COVAR_SAMP</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">CREATE</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">CREATEDB</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">CREATEROLE</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">CREATEUSER</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">CROSS</tt></td><td>保留(可以是函数)</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">CSV</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">CUBE</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">CUME_DIST</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">CURRENT</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">CURRENT_DATE</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">CURRENT_DEFAULT_TRANSFORM_GROUP</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">CURRENT_PATH</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">CURRENT_ROLE</tt></td><td>保留</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">CURRENT_TIME</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">CURRENT_TIMESTAMP</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">CURRENT_TRANSFORM_GROUP_FOR_TYPE</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">CURRENT_USER</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">CURSOR</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">CURSOR_NAME</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">CYCLE</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">DATA</tt></td><td>&nbsp;</td><td>非保留</td><td>保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">DATABASE</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">DATE</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">DATETIME_INTERVAL_CODE</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">DATETIME_INTERVAL_PRECISION</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">DAY</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">DEALLOCATE</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">DEC</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">DECIMAL</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">DECLARE</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">DEFAULT</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">DEFAULTS</tt></td><td>非保留</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">DEFERRABLE</tt></td><td>保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">DEFERRED</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">DEFINED</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">DEFINER</tt></td><td>非保留</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">DEGREE</tt></td><td>&nbsp;</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">DELETE</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">DELIMITER</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">DELIMITERS</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">DENSE_RANK</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">DEPTH</tt></td><td>&nbsp;</td><td>非保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">DEREF</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">DERIVED</tt></td><td>&nbsp;</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">DESC</tt></td><td>保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">DESCRIBE</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">DESCRIPTOR</tt></td><td>&nbsp;</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">DESTROY</tt></td><td>&nbsp;</td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">DESTRUCTOR</tt></td><td>&nbsp;</td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">DETERMINISTIC</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">DIAGNOSTICS</tt></td><td>&nbsp;</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">DICTIONARY</tt></td><td>&nbsp;</td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">DISABLE</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">DISCONNECT</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">DISPATCH</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">DISTINCT</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">DO</tt></td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">DOMAIN</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">DOUBLE</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">DROP</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">DYNAMIC</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">DYNAMIC_FUNCTION</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">DYNAMIC_FUNCTION_CODE</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">EACH</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">ELEMENT</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">ELSE</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">ENABLE</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">ENCODING</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">ENCRYPTED</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">END</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">END-EXEC</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">EQUALS</tt></td><td>&nbsp;</td><td>非保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">ESCAPE</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">EVERY</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">EXCEPT</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">EXCEPTION</tt></td><td>&nbsp;</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">EXCLUDE</tt></td><td>&nbsp;</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">EXCLUDING</tt></td><td>非保留</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">EXCLUSIVE</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">EXEC</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">EXECUTE</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">EXISTING</tt></td><td>&nbsp;</td><td>&nbsp;</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">EXISTS</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>非保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">EXP</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">EXPLAIN</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">EXTERNAL</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">EXTRACT</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>非保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">FALSE</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">FETCH</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">FILTER</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">FINAL</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">FIRST</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">FLOAT</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">FLOOR</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">FOLLOWING</tt></td><td>&nbsp;</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">FOR</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">FORCE</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">FOREIGN</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">FORTRAN</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">FORWARD</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">FOUND</tt></td><td>&nbsp;</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">FREE</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">FREEZE</tt></td><td>保留(可以是函数)</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">FROM</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">FULL</tt></td><td>保留(可以是函数)</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">FUNCTION</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">FUSION</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">G</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">GENERAL</tt></td><td>&nbsp;</td><td>非保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">GENERATED</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">GET</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">GLOBAL</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">GO</tt></td><td>&nbsp;</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">GOTO</tt></td><td>&nbsp;</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">GRANT</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">GRANTED</tt></td><td>非保留</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">GREATEST</tt></td><td>非保留(不能是函数或类型)</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">GROUP</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">GROUPING</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">HANDLER</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">HAVING</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">HEADER</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">HIERARCHY</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">HOLD</tt></td><td>非保留</td><td>保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">HOST</tt></td><td>&nbsp;</td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">HOUR</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">IDENTITY</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">IF</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">IGNORE</tt></td><td>&nbsp;</td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">ILIKE</tt></td><td>保留(可以是函数)</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">IMMEDIATE</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">IMMUTABLE</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">IMPLEMENTATION</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">IMPLICIT</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">IN</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">INCLUDING</tt></td><td>非保留</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">INCREMENT</tt></td><td>非保留</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">INDEX</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">INDEXES</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">INDICATOR</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">INFIX</tt></td><td>&nbsp;</td><td>&nbsp;</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">INHERIT</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">INHERITS</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">INITIALIZE</tt></td><td>&nbsp;</td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">INITIALLY</tt></td><td>保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">INNER</tt></td><td>保留(可以是函数)</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">INOUT</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">INPUT</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">INSENSITIVE</tt></td><td>非保留</td><td>保留</td><td>非保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">INSERT</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">INSTANCE</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">INSTANTIABLE</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">INSTEAD</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">INT</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">INTEGER</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">INTERSECT</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">INTERSECTION</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">INTERVAL</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">INTO</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">INVOKER</tt></td><td>非保留</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">IS</tt></td><td>保留(可以是函数)</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">ISNULL</tt></td><td>保留(可以是函数)</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">ISOLATION</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">ITERATE</tt></td><td>&nbsp;</td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">JOIN</tt></td><td>保留(可以是函数)</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">K</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">KEY</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">KEY_MEMBER</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">KEY_TYPE</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">LANCOMPILER</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">LANGUAGE</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">LARGE</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">LAST</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">LATERAL</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">LEADING</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">LEAST</tt></td><td>非保留(不能是函数或类型)</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">LEFT</tt></td><td>保留(可以是函数)</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">LENGTH</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">LESS</tt></td><td>&nbsp;</td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">LEVEL</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">LIKE</tt></td><td>保留(可以是函数)</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">LIMIT</tt></td><td>保留</td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">LISTEN</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">LN</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">LOAD</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">LOCAL</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">LOCALTIME</tt></td><td>保留</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">LOCALTIMESTAMP</tt></td><td>保留</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">LOCATION</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">LOCATOR</tt></td><td>&nbsp;</td><td>非保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">LOCK</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">LOGIN</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">LOWER</tt></td><td>&nbsp;</td><td>保留</td><td>非保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">M</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">MAP</tt></td><td>&nbsp;</td><td>非保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">MATCH</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">MATCHED</tt></td><td>&nbsp;</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">MAX</tt></td><td>&nbsp;</td><td>保留</td><td>非保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">MAXVALUE</tt></td><td>非保留</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">MEMBER</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">MERGE</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">MESSAGE_LENGTH</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">MESSAGE_OCTET_LENGTH</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">MESSAGE_TEXT</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">METHOD</tt></td><td>&nbsp;</td><td>保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">MIN</tt></td><td>&nbsp;</td><td>保留</td><td>非保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">MINUTE</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">MINVALUE</tt></td><td>非保留</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">MOD</tt></td><td>&nbsp;</td><td>保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">MODE</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">MODIFIES</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">MODIFY</tt></td><td>&nbsp;</td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">MODULE</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">MONTH</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">MORE</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">MOVE</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">MULTISET</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">MUMPS</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">NAME</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">NAMES</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">NATIONAL</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">NATURAL</tt></td><td>保留(可以是函数)</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">NCHAR</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">NCLOB</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">NESTING</tt></td><td>&nbsp;</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">NEW</tt></td><td>保留</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">NEXT</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">NO</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">NOCREATEDB</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">NOCREATEROLE</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">NOCREATEUSER</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">NOINHERIT</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">NOLOGIN</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">NONE</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">NORMALIZE</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">NORMALIZED</tt></td><td>&nbsp;</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">NOSUPERUSER</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">NOT</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">NOTHING</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">NOTIFY</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">NOTNULL</tt></td><td>保留(可以是函数)</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">NOWAIT</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">NULL</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">NULLABLE</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">NULLIF</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>非保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">NULLS</tt></td><td>&nbsp;</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">NUMBER</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">NUMERIC</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">OBJECT</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">OCTETS</tt></td><td>&nbsp;</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">OCTET_LENGTH</tt></td><td>&nbsp;</td><td>保留</td><td>非保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">OF</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">OFF</tt></td><td>保留</td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">OFFSET</tt></td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">OIDS</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">OLD</tt></td><td>保留</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">ON</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">ONLY</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">OPEN</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">OPERATION</tt></td><td>&nbsp;</td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">OPERATOR</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">OPTION</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">OPTIONS</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">OR</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">ORDER</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">ORDERING</tt></td><td>&nbsp;</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">ORDINALITY</tt></td><td>&nbsp;</td><td>非保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">OTHERS</tt></td><td>&nbsp;</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">OUT</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">OUTER</tt></td><td>保留(可以是函数)</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">OUTPUT</tt></td><td>&nbsp;</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">OVER</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">OVERLAPS</tt></td><td>保留(可以是函数)</td><td>保留</td><td>非保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">OVERLAY</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">OVERRIDING</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">OWNED</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">OWNER</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">PAD</tt></td><td>&nbsp;</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">PARAMETER</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">PARAMETERS</tt></td><td>&nbsp;</td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">PARAMETER_MODE</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">PARAMETER_NAME</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">PARAMETER_ORDINAL_POSITION</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">PARAMETER_SPECIFIC_CATALOG</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">PARAMETER_SPECIFIC_NAME</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">PARAMETER_SPECIFIC_SCHEMA</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">PARTIAL</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">PARTITION</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">PASCAL</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">PASSWORD</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">PATH</tt></td><td>&nbsp;</td><td>非保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">PERCENTILE_CONT</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">PERCENTILE_DISC</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">PERCENT_RANK</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">PLACING</tt></td><td>保留</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">PLI</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">POSITION</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>非保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">POSTFIX</tt></td><td>&nbsp;</td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">POWER</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">PRECEDING</tt></td><td>&nbsp;</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">PRECISION</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">PREFIX</tt></td><td>&nbsp;</td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">PREORDER</tt></td><td>&nbsp;</td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">PREPARE</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">PREPARED</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">PRESERVE</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">PRIMARY</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">PRIOR</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">PRIVILEGES</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">PROCEDURAL</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">PROCEDURE</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">PUBLIC</tt></td><td>&nbsp;</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">QUOTE</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">RANGE</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">RANK</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">READ</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">READS</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">REAL</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">REASSIGN</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">RECHECK</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">RECURSIVE</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">REF</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">REFERENCES</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">REFERENCING</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">REGR_AVGX</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">REGR_AVGY</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">REGR_COUNT</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">REGR_INTERCEPT</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">REGR_R2</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">REGR_SLOPE</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">REGR_SXX</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">REGR_SXY</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">REGR_SYY</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">REINDEX</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">RELATIVE</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">RELEASE</tt></td><td>非保留</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">RENAME</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">REPEATABLE</tt></td><td>非保留</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">REPLACE</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">RESET</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">RESTART</tt></td><td>非保留</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">RESTRICT</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">RESULT</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">RETURN</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">RETURNED_CARDINALITY</tt></td><td>&nbsp;</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">RETURNED_LENGTH</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">RETURNED_OCTET_LENGTH</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">RETURNED_SQLSTATE</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">RETURNING</tt></td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">RETURNS</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">REVOKE</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">RIGHT</tt></td><td>保留(可以是函数)</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">ROLE</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">ROLLBACK</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">ROLLUP</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">ROUTINE</tt></td><td>&nbsp;</td><td>非保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">ROUTINE_CATALOG</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">ROUTINE_NAME</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">ROUTINE_SCHEMA</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">ROW</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">ROWS</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">ROW_COUNT</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">ROW_NUMBER</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">RULE</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">SAVEPOINT</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">SCALE</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">SCHEMA</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">SCHEMA_NAME</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">SCOPE</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">SCOPE_CATALOG</tt></td><td>&nbsp;</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">SCOPE_NAME</tt></td><td>&nbsp;</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">SCOPE_SCHEMA</tt></td><td>&nbsp;</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">SCROLL</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">SEARCH</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">SECOND</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">SECTION</tt></td><td>&nbsp;</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">SECURITY</tt></td><td>非保留</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">SELECT</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">SELF</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">SENSITIVE</tt></td><td>&nbsp;</td><td>保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">SEQUENCE</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">SERIALIZABLE</tt></td><td>非保留</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">SERVER_NAME</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">SESSION</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">SESSION_USER</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">SET</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">SETOF</tt></td><td>非保留(不能是函数或类型)</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">SETS</tt></td><td>&nbsp;</td><td>非保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">SHARE</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">SHOW</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">SIMILAR</tt></td><td>保留(可以是函数)</td><td>保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">SIMPLE</tt></td><td>非保留</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">SIZE</tt></td><td>&nbsp;</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">SMALLINT</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">SOME</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">SOURCE</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">SPACE</tt></td><td>&nbsp;</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">SPECIFIC</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">SPECIFICTYPE</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">SPECIFIC_NAME</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">SQL</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">SQLCODE</tt></td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">SQLERROR</tt></td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">SQLEXCEPTION</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">SQLSTATE</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">SQLWARNING</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">SQRT</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">STABLE</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">START</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">STATE</tt></td><td>&nbsp;</td><td>非保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">STATEMENT</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">STATIC</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">STATISTICS</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">STDDEV_POP</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">STDDEV_SAMP</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">STDIN</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">STDOUT</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">STORAGE</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">STRICT</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">STRUCTURE</tt></td><td>&nbsp;</td><td>非保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">STYLE</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">SUBCLASS_ORIGIN</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">SUBLIST</tt></td><td>&nbsp;</td><td>&nbsp;</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">SUBMULTISET</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">SUBSTRING</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>非保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">SUM</tt></td><td>&nbsp;</td><td>保留</td><td>非保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">SUPERUSER</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">SYMMETRIC</tt></td><td>保留</td><td>保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">SYSID</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">SYSTEM</tt></td><td>非保留</td><td>保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">SYSTEM_USER</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">TABLE</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">TABLESAMPLE</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">TABLESPACE</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">TABLE_NAME</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">TEMP</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">TEMPLATE</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">TEMPORARY</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">TERMINATE</tt></td><td>&nbsp;</td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">THAN</tt></td><td>&nbsp;</td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">THEN</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">TIES</tt></td><td>&nbsp;</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">TIME</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">TIMESTAMP</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">TIMEZONE_HOUR</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">TIMEZONE_MINUTE</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">TO</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">TOP_LEVEL_COUNT</tt></td><td>&nbsp;</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">TRAILING</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">TRANSACTION</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">TRANSACTIONS_COMMITTED</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">TRANSACTIONS_ROLLED_BACK</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">TRANSACTION_ACTIVE</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">TRANSFORM</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">TRANSFORMS</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">TRANSLATE</tt></td><td>&nbsp;</td><td>保留</td><td>非保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">TRANSLATION</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">TREAT</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">TRIGGER</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">TRIGGER_CATALOG</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">TRIGGER_NAME</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">TRIGGER_SCHEMA</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">TRIM</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>非保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">TRUE</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">TRUNCATE</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">TRUSTED</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">TYPE</tt></td><td>非保留</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">UESCAPE</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">UNBOUNDED</tt></td><td>&nbsp;</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">UNCOMMITTED</tt></td><td>非保留</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">UNDER</tt></td><td>&nbsp;</td><td>非保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">UNENCRYPTED</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">UNION</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">UNIQUE</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">UNKNOWN</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">UNLISTEN</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">UNNAMED</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>非保留</td></tr>
<tr><td><tt class="TOKEN">UNNEST</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">UNTIL</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">UPDATE</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">UPPER</tt></td><td>&nbsp;</td><td>保留</td><td>非保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">USAGE</tt></td><td>&nbsp;</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">USER</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">USER_DEFINED_TYPE_CATALOG</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">USER_DEFINED_TYPE_CODE</tt></td><td>&nbsp;</td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">USER_DEFINED_TYPE_NAME</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">USER_DEFINED_TYPE_SCHEMA</tt></td><td>&nbsp;</td><td>非保留</td><td>非保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">USING</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">VACUUM</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">VALID</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">VALIDATOR</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">VALUE</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">VALUES</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">VARCHAR</tt></td><td>非保留(不能是函数或类型)</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">VARIABLE</tt></td><td>&nbsp;</td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">VARYING</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">VAR_POP</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">VAR_SAMP</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">VERBOSE</tt></td><td>保留(可以是函数)</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">VIEW</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">VOLATILE</tt></td><td>非保留</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">WHEN</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">WHENEVER</tt></td><td>&nbsp;</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">WHERE</tt></td><td>保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">WIDTH_BUCKET</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">WINDOW</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">WITH</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">WITHIN</tt></td><td>&nbsp;</td><td>保留</td><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">WITHOUT</tt></td><td>非保留</td><td>保留</td><td>保留</td><td>&nbsp;</td></tr>
<tr><td><tt class="TOKEN">WORK</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">WRITE</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">YEAR</tt></td><td>非保留</td><td>&nbsp;</td><td>保留</td><td>保留</td></tr>
<tr><td><tt class="TOKEN">ZONE</tt></td><td>非保留</td><td>非保留</td><td>保留</td><td>保留</td></tr>
</tbody>
</table>
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